Making a generalized statement like 'disc brakes' is like painting all hybrids with the same brush or claiming all tires are created equal. Don't know what single experience you want to base that opinion on but my experience is pretty much like any other component - some are better than others and the ones I use myself I'm just fine with.

I also use single and double pivot road brakes, cantis and V-brakes and none of them give me a problem. Being a trained mechanic and knowing which ones are worth buying in the first place may have something to do with that.